Text Diff Tool: How to Compare Documents and Find Changes
Sunil Kalikayi4/8/20264 min read
How Text Diff Works
Diff algorithms compare sequences line-by-line (or word-by-word). Lines present in document A but not B are deletions (shown in red). Lines in B but not A are additions (shown in green). Unchanged lines are shown in white. The diff algorithm (commonly Myers diff) finds the minimal edit distance between two texts.
Use Cases Beyond Code
Contract revisions: compare two versions of a legal document. Content editing: show what an editor changed in an article draft. Template management: verify a filled-out template matches the expected structure. Policy updates: surface what changed between two versions of a terms document.